CAD tip # 8411:

When you modify a dimensioned geometry, the attached associative dimension should be updated automatically. Verify this functionality on a newly drawn and dimensioned object.

If the dimension is still not updated automatically updated, try to enter the following command (LISP function) in your AutoCAD command line:

(acdimenableupdate T)

This will re-enable associativity. This function is rarely used, but temporary suppression of automatic updates may be a part of some add-on LISP utilities (makes them faster). They disable automatic updates with the function format (acdimenableupdate nil).

Even in a disabled state, dimensions can be updated manually, with the DIMREGEN command.

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